Ever +EV to fold KK in a cash game?

[br.bm]

folding is always 0EV (you never win anything by folding, but you never loose anything either)

here are some numbers
Make up a different scenario (villian raise, I reraise to 20BB, he pushes) and you have to be very sure he does push w/ QQ, AK, AQ etc to make a call +EV
And in the NL50, NL100 FR games of fulltilt I never saw someone 4bet 100BB all in vs a 100BB stack with AQ or QQ. Even AK is very very rare.